I was wondering about the S&W 3rd gen auto pistols. Their performance center advertises a DAO conversion. When you do this with a standard gun w/safety, can you still engage the safety. I have been thinking about getting one of the new chiefs specials in .45, for IWB carry. I have tried other S&W with DAO from the factory, and it was a relatively smooth pull for every shot. Alot lighter than the standard pull. I would like to retain the use of the manual safety though. (I think that it's a psycological thing, I just like manual safetys and double action on any gun I carry in my pants.) Have any of you had this done?